wane DELETED! (SEmMINoLr) Project 8.5 —- Airborne High Resolution Spectral Analysis - R. Zirkind OBJECTIVE To determine the spectral characteristics of the radiant power of a 30 - 40 kiloton burst as a function of wavelength and the fireball color temperature as seen from an airborne station. These ob- jectives are to be accomplished by determining the atmospheric attenuation by an independent measurement and correcting the irradiance received at the instrument station aboard the aircraft. INSTRUMENTATION The spectral distribution of the radiant power is obtained from a medium quartz Hilger spectrometer. The spectrum is sampled in nar- row bands by photocells in the visible region and PbS cells in the infra-red. The electrical signal is then recorded on an Ampex 814 tape recorder, with a resolution time of 150 ~.sec, The transmission Measurement is accomplished by beaming a pulsed light signal of known output and spectral distribution from a fixed point on the ground towards the aircraft. The attenuated beam is received by a detector in the aircraft and recorded on a Heiland recorder. The detector con- sists of two filtered photomultiplier tubes sampling two spectral regions, (1) .3-.55 microns and (2) .6-1.05 microns, In addition, a quartz filtered calorimeter, 22 degrees field of view, is utilized to Measure the approximate radiant exposure received at the spectrometer. RESULTS The P2V aircraft aborted at H-30 minutes due to an engine failure. Aircraft and crew returned safely. On SEMINOLE plus 2 days the engine was replaced and aircraft placed in operational readiness condition for the next shot. COPIEDpoe ~ 2 =